Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh Perm-selectivity Desalination |
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Authors: | BIAN Xiangying ZHANG Yuping GONG Li ZHU Yuzhang JIN Jian |
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Institution: | i-Lab and CAS Key Laboratory of Nano-Bio Interface,CAS Center for Excellence in Nanoscience,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,P.R.China;College of Chemistry,Chemical Engineering and Materials Science &Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215123,P.R.China;i-Lab and CAS Key Laboratory of Nano-Bio Interface,CAS Center for Excellence in Nanoscience,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,P.R.China;College of Chemistry,Chemical Engineering and Materials Science &Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215123,P.R.China |
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Abstract: | Improving the permeate flux but retaining the rejection of thin-film composite(TFC) polyamide nanofiltration(NF) membrane is a high requirement for desalination. In this work, a calcium ion(Ca2+) coordinated polyamide(PA) NF membrane was prepared by directly adding CaCl2 to the piperazine(PIP) aqueous solution during the interfacial polymerization process. Due to the coordination interaction between Ca2+ and the amide bond in PA active layer, the number of hydrogen bonds in the PA active layer was reduced, causing in turn the decrease of physical cross-linking degree. As a consequence, the pore of the PA active layer was enlarged, prominently enhancing the water permeance of NF membrane. With the increase of CaCl2 concentration, the pure water flux of TFC NF increased significantly while the rejection of Na2SO4 decreased sightly. Compared with TFC NF membrane prepared without CaCl2, the permeate flux of the Ca2+ coordinated polyamide NF membrane prepared under optimal conditions was increased by 3-4 folds with Na2SO4 rejection of 95.26%. Meanwhile, such a Ca2+ coordinated PA NF membrane showed a better SO42-/Cl- selectivity. |
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Keywords: | Nanofiltration membrane Calcium chloride Interfacial polymerization Ion selectivity |
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